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  Section: Biotechnology Methods » Molecular Biology
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Extraction of DNA from Goat Liver

Molecular Biology
  The Central Dogma
  Protein Synthesis in Cell Free Systems
  Polytene Chromosomes of Dipterans
  Salivary Gland Preparation (Squash Technique)
  Extraction of Chromatin
  Chromatin Electrophoresis
  Extraction and Electrophoresis of Histones
  Karyotype Analysis
  In Situ Hybridization
  Culturing Peripheral Blood Lymphocytes
  Microslide Preparation of Metaphases for In-Situ Hybridization
  Staining Chromosomes (G-Banding)
  Nucleic Acids
  Extraction of DNA from Bovine Spleen
  Purification of DNA
  Characterization of DNA
  DNA-Dische Diphenylamine Determination
  Melting Point Determination
  CsCl-Density Separation of DNA
  Phenol Extraction of rRNA (Rat liver)
  Spectrophotometric Analysis of rRNA
  Determination of Amount of RNA by the Orcinol Method
  Sucrose Density Fractionation
  Nucleotide Composition of RNA
  Isolation of Genomic DNA—DNA Extraction Procedure
  Isolation of Genomic DNA from Bacterial Cells
  Preparation of Genomic DNA from Bacteria
  Extraction of Genomic DNA from Plant Source
  Extraction of DNA from Goat Liver
  Isolation of Cotton Genomic DNA from Leaf Tissue
  Arabidopsis Thaliana DNA Isolation
  Plant DNA Extraction
  Phenol/Chloroform Extraction of DNA
  Ethanol Precipitation of DNA
  Isolation of Mitochondrial DNA
  Isolation of Chloroplast DNA
  DNA Extraction of Rhizobium (CsCl Method)
  Isolation of Plasmids
  RNA Isolation
  Preparation of Vanadyl-Ribonucleoside Complexes that Inhibit Ribonuclease Activity
  RNA Extraction Method for Cotton
  Isolation of RNA from Bacteroids
  Isolation of RNA from Free-Living Rhizobia
  Estimation of DNA purity and Quantification
  Fungal DNA Isolation
  Methylene Blue DNA Staining
  Blotting Techniques—Southern, Northern, Western Blotting
  Preparing the Probe
  Southern Blotting (First Method)
  Southern Blotting (Second Method)
  Western Blotting
  Western Blot Analysis of Epitoped-tagged Proteins using the Chemifluorescent Detection Method for Alkaline Phosphatase-conjugated Antibodies
  Southern Blot
  Southern Analysis of Mouse Toe/Tail DNA
  Northern Blotting
  Restriction Digestion Methods—Restriction Enzyme Digests
  Restriction Digestion of Plasmid, Cosmid, and Phage DNAs
  Manual Method of Restriction Digestion of Human DNA
  Preparation of High-Molecular-Weight Human DNA Restriction Fragments in Agarose Plugs
  Restriction Enzyme Digestion of DNA
  Electroelution of DNA Fragments from Agarose into Dialysis Tubing
  Isolation of Restriction Fragments from Agarose Gels by Collection onto DEAE Cellulose
  Ligation of Insert DNA to Vector DNA
  PCR Methods (Polymerase Chain Reaction)
  Polymerase Chain Reaction
  DNA Amplification by the PCR Method


DNA can be isolated from cells and tissues by high salt or phenol extraction. Here, chromatin and proteins are dissociated by treatment with SDS. The proteins are denatured by phenyl chloroform treatment. It becomes insoluble and can be prepared by the following chemicals.

  • Ethanol
  • Saline
  • EDTA
  • pH-8.0 (0.9% NaCl and 0.01 M EDTA)
  • 10% SDS
  • 80% phenol
  • 95% ethanol
  1. 2.5 gm of liver tissue was homogenized in 25 mL of saline EDTA and transferred to a 250-mL conical flask.
  2. To this, 2.5 mL of 10% SDS and 2.5 mL of 80% phenol was added and shaken well for 10 minutes.
  3. The entire mixture was centrifuged at 10000 rpm for 10 minutes. The aqueous layer was separated out.
  4. To the remaining material, (interphase + phenol phase), equal volume of chloroform, isoamyl alcohol (24 : 1) was added and shaken for 25 minutes.
  5. It was again centrifuged at 10000 rpm for 10 minutes.
  6. The aqueous phase was collected.
  7. To the aqueous phase, equal volume of 80% phenol was added and again centrifuged at 10000 rpm for 10 minutes.
  8. To the aqueous phase obtained, 95% ice cold ethanol was added and then the flask was shaken gently.
  9. The DNA are precipitated as a white mass.
By the addition of ice-cold ethanol, DNA strands were obtained as a white mass or turbidity.


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